waitForAll(dependencies)

一个并发助手，允许我们并发地评估多个异步依赖项。

依赖项可以作为元组数组提供，也可以作为对象中的命名依赖项提供。

---

function waitForAll(dependencies: Array<RecoilValue<>>):
  RecoilValueReadOnly<UnwrappedArray>

function waitForAll(dependencies: {[string]: RecoilValue<>}):
  RecoilValueReadOnly<UnwrappedObject>

---

由于并发助手作为选择器提供，因此它可以在 React 组件中被 Recoil 钩子使用，作为 Recoil 选择器中的依赖项，或者在任何使用 Recoil 状态的地方使用。

示例

function FriendsInfo() {
  const [friendA, friendB] = useRecoilValue(
    waitForAll([friendAState, friendBState])
  );
  return (
    <div>
      Friend A Name: {friendA.name}
      Friend B Name: {friendB.name}
    </div>
  );
}

const friendsInfoQuery = selector({
  key: 'FriendsInfoQuery',
  get: ({get}) => {
    const {friendList} = get(currentUserInfoQuery);
    const friends = get(waitForAll(
      friendList.map(friendID => userInfoQuery(friendID))
    ));
    return friends;
  },
});

const customerInfoQuery = selectorFamily({
  key: 'CustomerInfoQuery',
  get: id => ({get}) => {
    const {info, invoices, payments} = get(waitForAll({
      info: customerInfoQuery(id),
      invoices: invoicesQuery(id),
      payments: paymentsQuery(id),
    }));

    return {
      name: info.name,
      transactions: [
        ...invoices,
        ...payments,
      ],
    };
  },
});